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ps.1.1
// Alpha blend layers, output base alpha
//
// Color is t0 * (1 - t1.a) + t1 * t1.a
// Alpha is t0.a
tex t0
tex t1
lrp r0.rgb, t1.a, t1, t0
mov r0.a, t0;
mul r0, r0, v0;